27928129 has 2 divisors, whose sum is σ = 27928130. Its totient is φ = 27928128.

The previous prime is 27928123. The next prime is 27928133. The reversal of 27928129 is 92182972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 49729 = 5280^2 + 223^2 .

It is a cyclic number.

It is not a de Polignac number, because 27928129 - 2¹⁹ = 27403841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27928091 and 27928100.

It is not a weakly prime, because it can be changed into another prime (27928123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13964064 + 13964065.

It is an arithmetic number, because the mean of its divisors is an integer number (13964065).

Almost surely, 2^27928129 is an apocalyptic number.

It is an amenable number.

27928129 is a deficient number, since it is larger than the sum of its proper divisors (1).

27928129 is an equidigital number, since it uses as much as digits as its factorization.

27928129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 27928129 is about 5284.7070874364. The cubic root of 27928129 is about 303.3988618510.

The spelling of 27928129 in words is "twenty-seven million, nine hundred twenty-eight thousand, one hundred twenty-nine".